As expected, the present approach performs well with a suitable geometry for thin-walled concrete blocks to protect coastal areas from climate change. It is found that SPH-FEM model can capture the entire FSI process deformation of a complex geometry. The SPH-FEM model is validated by interaction of elastic gate with water pressure, the results are compared with previous research and show very good agreement. The interaction between a thin-walled concrete block and wave under different initial conditions is modeled by ABAQUS. SPH is a mesh-free method, which is flexible to model and analyze complicated problem domains. Finite Element Method (FEM) is used to model the solid structure. In this study, Smoothed Particle Hydrodynamic (SPH) method is utilized to model the fluid domain. Fluid-Structure Interaction (FSI) is one of the interesting subjects in coastal construction.
